DFSMS control data sets must be protected in accordance with security requirements.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-3895	ZSMS0020	SV-7357r3_rule		Medium

Description
DFSMS control data sets provide the configuration and operational characteristics of the system-managed storage environment. Failure to properly protect these data sets may result in unauthorized access. This exposure could compromise the availability and integrity of some system services and customer data.

STIG	Date
z/OS RACF STIG	2019-09-27

Details

Check Text ( C-72933r1_chk )
a) Refer to the following report produced by the Data Set and Resource Data Collection: - SENSITVE.RPT(SMSRPT) Automated Analysis Refer to the following report produced by the Data Set and Resource Data Collection: - PDI(ZSMS0020) b) Review the logical parmlib data sets, example: SYS1.PARMLIB(IGDSMSxx), to identify the fully qualified file names for the following SMS data sets: Source Control Data Set (SCDS) Active Control Data Set (ACDS) Communications Data Set (COMMDS) Automatic Class Selection Routine Source Data Sets (ACS) ACDS Backup COMMDS Backup c) If the RACF data set rules for the SCDS, ACDS, COMMDS, and ACS data sets restrict UPDATE and ALTER access to only systems programming personnel, this is not a finding. d) If the RACF data set rules for the SCDS, ACDS, COMMDS, and ACS data sets do not restrict UPDATE and ALTER access to only systems programming personnel, this is a finding. Note: At the discretion of the ISSM, DASD administrators are allowed UPDATE access to the control datasets.

Check Text ( C-72933r1_chk )

a) Refer to the following report produced by the Data Set and Resource Data Collection:

- SENSITVE.RPT(SMSRPT)

Automated Analysis
Refer to the following report produced by the Data Set and Resource Data Collection:

- PDI(ZSMS0020)

b) Review the logical parmlib data sets, example: SYS1.PARMLIB(IGDSMSxx), to identify the fully qualified file names for the following SMS data sets:

Source Control Data Set (SCDS)
Active Control Data Set (ACDS)
Communications Data Set (COMMDS)
Automatic Class Selection Routine Source Data Sets (ACS)
ACDS Backup
COMMDS Backup

c) If the RACF data set rules for the SCDS, ACDS, COMMDS, and ACS data sets restrict UPDATE and ALTER access to only systems programming personnel, this is not a finding.

d) If the RACF data set rules for the SCDS, ACDS, COMMDS, and ACS data sets do not restrict UPDATE and ALTER access to only systems programming personnel, this is a finding.

Note: At the discretion of the ISSM, DASD administrators are allowed UPDATE access to the control datasets.

Fix Text (F-79239r1_fix)
Review the SYS1.PARMLIB(IGDSMS00) data set to identify the fully qualified file names for the following SMS data sets: Source Control Data Set (SCDS) Active Control Data Set (ACDS) Communications Data Set (COMMDS) Automatic Class Selection Routine Source Data Sets (ACS) ACDS Backup COMMDS Backup The RACF data set rules for the SCDS, ACDS, COMMDS, and ACS data sets must restrict UPDATE and ALTER access to only z/OS systems programming personnel. Note: At the discretion of the ISSM, DASD administrators are allowed UPDATE access to the control datasets. Some example commands to implement the proper controls are shown here: AD 'sys3.dfsms.mmd.commds.' UACC(NONE) OWNER(SYS3) AUDIT(ALL(READ)) DATA('PROTECTED PER ZSMS0020') PE 'sys3.dfsms.mmd.commds.' ID() ACC(A)

Fix Text (F-79239r1_fix)

Review the SYS1.PARMLIB(IGDSMS00) data set to identify the fully qualified file names for the following SMS data sets:

Source Control Data Set (SCDS)
Active Control Data Set (ACDS)
Communications Data Set (COMMDS)
Automatic Class Selection Routine Source Data Sets (ACS)
ACDS Backup
COMMDS Backup

The RACF data set rules for the SCDS, ACDS, COMMDS, and ACS data sets must restrict UPDATE and ALTER access to only z/OS systems programming personnel.

Note: At the discretion of the ISSM, DASD administrators are allowed UPDATE access to the control datasets.

Some example commands to implement the proper controls are shown here:

AD 'sys3.dfsms.mmd.commds.**' UACC(NONE) OWNER(SYS3) AUDIT(ALL(READ)) DATA('PROTECTED PER ZSMS0020')

PE 'sys3.dfsms.mmd.commds.**' ID() ACC(A)